Title :
Local atomic configuration and Auger valence electron spectra in BiSrCaCuO single crystals
Author :
Fujiwara, Y. ; Hirata, S. ; Nishikubo, M. ; Kobayashi, T. ; Nakayama, H. ; Fujita, H.
Author_Institution :
Fac. of Eng. Sci., Osaka Univ., Japan
fDate :
3/1/1991 12:00:00 AM
Abstract :
Bi2Sr2CaCu2Oy (2212) and Ca-doped Bi2Sr2CuOy (2201) single crystals were systematically investigated by Auger valence electron spectroscopy (AVES). In AVES measurements on two kinds of crystals, a drastic difference was observed in the spectral shape of Ca[2p,3p,3p] reflecting a difference in spin-orbit splitting induced by local atomic configuration in the vicinity of Ca atoms. Furthermore, a Ca[2p,3p,4s] spectrum appeared in both crystals, indicating that the real valence of Ca atoms deviates from +2 in the crystals. The results suggest that AVES is a promising probe for characterizing local atomic configuration and valence electron states of the constituent elements
Keywords :
Auger effect; bismuth compounds; calcium compounds; crystal atomic structure of inorganic compounds; high-temperature superconductors; spectral line breadth; spin-orbit interactions; strontium compounds; valency; AVES; Auger valence electron spectra; Bi2Sr2CaCu2Oy; Bi2Sr2CuOy:Ca; high temperature superconductors; local atomic configuration; single crystals; spectral shape; spin-orbit splitting; valence electron states; Atomic measurements; Bonding; Chemicals; Crystals; Electrons; Probes; Spectroscopy; Superconducting devices; Superconducting thin films; Superconductivity;
Journal_Title :
Magnetics, IEEE Transactions on
